Hi, looks like a standard US para helmet from the 1970's-80's to me, it may be a touch earlier but it is not a second world war lid. It is missing it's internal liner chinstrap and nape strap. Also the steel shell's chinstrap is incorrect for the para liner, so I guess this is a "put together" parts helmet. Leon.
"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." Ernest Hemingway
In your opinion is it worth 40 pounds?
Or should I stay clear?
Thanks for the information.